I found my first grey hairs at 17 (actually my friend sitting behind me in English class noticed them and said “wait, don’t move!” pluck!). Now at 26 seems as though every time I look in the mirror there are more and more of them taunting me. I use semi-permanent coloring on occasion, more for fun than anything, not that temporarily disguising the grey isn’t a bad thing (though that kind of coloring doesn’t stick to the grey hairs for long!). Honestly I remember in college knowing a few students who were going bald or gray… and they were your traditional aged students. If you want to play with color I say go for it, but I don’t think many people will look at you as being a geezer… people often think I’m about 18 despite the grey!